Motor attachment for sewing machines



Aug. 9,1927. B. GROSSBARD uowon ATTACHMENT FOR sswme mcnmns Filed March 15. 1926 I INVENTEIR mqywlw Patented Aug. 9,1927.

UNITED STATES BARNET GBOSSBARD, OF SAN FRANCISCO, CALIFORNIA.

MOTQR ATTACHMENT FOR SEWING MACHINES.

Application filed March 15, 1926. Serial No. 94,503.

This invention relates to motor attachments for sewing machines, and has for its principal object to provide a clutch mechanism of novel construction, readily applied to the drive shaft of a motor and the operating wheel of a sewing machine.

Another object of this invention is to provide a -motor attachment for sewing machines, having therein a novel double gripping clutch mechanism adapted to satisfactorily control the speed atwhich the sewing machine is to operate.

Another object of the present invention is to provide a novel clutch mechanism adapted for use in connection with a sew ng machine and a motor, whereby the sewing machine may be conveniently thrown into and out of operation and may be satisfactorily regulated as to speed. p

A further obj'ect of the present invention is to provide. a novel clutch mechanism adapted for use with a motor and a power driven machine whereby the machine may be operated by the motor at various speeds.

A further object of the present invention is to provide a novel clutch mechanism adapted for use with a motor and a power driven machine whereby the machine may be madeto operate at various speeds by the motor or the motor may be permltted to operate independently of the machine.

Other objects more or less apparent will be disclosed and described in the following specification and shown in the accompanying drawings, in which:

Fig. 1 is a side elevation of my attachment for sewing machines; and

Fig. 2 is a bottom plan View of the same.

Referring to the drawings, the numeral 1 designates a motor of the usual type and construction, having a shaft 2. Detachably secured to the shaft 2 by means of set screw 3 is a wheel 4c. Fitting around the wheel at is a fly wheel 5, to which is integrally attached a shaft 6 which is rotatably located inside bearing 7 The bearing 7 is held 1n place on the base 8 by a support 9 which fits inside a projection 10 on base 8, the said support being held in place and adjusted by a bolt screw 11. In order to provide suitable lubrication material for the bearing and shaft 6, a grease cup 12 is screwed into the said bearing.

Located between the wheel 4 and the inside surface of fiy wheel 5, is a circular disc 13 which is loosely mounted on the inwardly projecting part 14 of fly wheel 5. The circular disc 13 is provided on each of its sides near its circumferential edge with gripping pads 15, which are adapted to come 1nto contact with the inside surfaces of the wheel 4 and the fly wheel 5, thus contacting with the same in such a manner as to provide a double clutching mechanism.

The disc 13 together with the gripping pads 15 secured thereto, are held on the proecting part 14 of fly wheel 5 by a circular plate 16 which in turn is secured to the end of the said projecting part by screw 17.

The motor 1 is attached to the base 8 by screw 18, and the base is suitably attached by any suitable means such as bolts or screws to a sewing machine or other mechanism to be operated.

Located around the shaft 6 between the bearing 7 and the fly wheel 5 is a sleeve 19 which is made of the same material as the bearing and is adapted 'to rotate with the said shaft.

I ocated at the end of the shaft 6 within an indentation therein, is a steel ball 20, the same being movably held on the end of the said shaft by a flanged piece 21 which fits on the end of the said shaft and is secured thereto by a pin 22. r

The end of the motor where the other end of the shaft 2 is located is provided with a thrust bearing which is comprised of a steel ball 23 held within an indentation in the grooved plug 24,-the latter being located inside the end of the motor and held in place by screws 25. A pin25" is fastened to the end of motor shaft 2, and the same bears against the-ball 23 when the motor is operating.

The base 8 is provided with a projection 26, having therein a suitable recess for the insertion of a bar 27. The bar 27 is held within projection 26 by means of a set screw 28, and is adjusted thereby.

Pivoted on bar 27 by means of pin 29 is a lever 30 which has anextension 31 thereon. The extension 31 projects slightly beyond the ball 20 and is adapted to come in contact therewith.

Forming a part of bar 27 is an extension member 32, to the end of which is attached one end of a spiral wire spring 33. The other end of the spiral spring 33 rests against thelever 30 and tends to keep the extension 31 from pressing against the ball 20. Attached by a screw 34 to the upper part of lever 30, just below fly wheel 5 is a leather piece 35 which serves to prevent the revolving of the fly wheel when the device is not to be operated. r

Attached to the extension 31 by screws 36 is a forked member 37, the two forks of against the ball to cause the clutch mechanism to operate, holds the fly wheel 5, the

disc 13 and the pads 15 away from the wheel I from revolving.

- to the 1, thereby enabling the motor to operate in dependently of the clutching mechanism.

An extension rod 38 is attached to a suitable foot pedal or other device for throwing the machine to be operated through belt 39 into or out of operation.

When the attachment is out of operation the spring 33 forces the lever 30 upwardly, thereby causing the extension 21 to be released from contact with the ball 20, and the leather piece 35 to press against the fly wheel 5, thereby preventing the said fly wheel To cause the sewing machine or other mechanism to operate the rod 38 is pulled in a downward direction, thereby carrying with it lever 30, which caures the extension 31 to move inwardly and be forced against the ball 20. The wheel 1 which is secured to the shaft 2 revolves with the said shaft upon the movement of the motor. As the ball 20, the shaft 6, the fly wheel 5 and the disc 13 are forced inwardly by the extension 31, the pads 15 located on the said disc come into contact with the wheel 4 and the fly wheel 5, thereby transferring the revolving motion of the wheel 4 fly wheel 5. A suitable belt 39 is attached to the fly wheel 5 and a sewing or other machine to be operated, and as the said fly wheel revolves the said machine is made to operate. The construction of the clutch mechanism with the disc 13 and donble gripping pads 15 located between the wheel 4 and the fly wheel 5, enable the operation of the sewing or other machine at any desired speed, dependent solely upon the downward force applied to the rod 38.

The attachment herein shown and described may be readily applied or removed shown and described may be applied to and from the driving shaft of a motor, and the construction is such that an attachment of this form can be applied to practically all existing typesof sewing machines, and also to many other types of machines which are to be operated at various speeds by a motor.

Itis obvious that the attachment herein used in operating mechanisms of various kinds other than sewingmachines'. I therefore do not desire my invention to be confined in its use to sewing machines alone, nor

to be limited to the exact construction here- 1n shown, but desire it to be included within the spirit of the appended claims.

Having described my invention, what I claim is:

1. A motor attachment of the class described comprising, in combination with a motor, a wheel secured to the shaft of the motor, a fly wheel having a shaft thereon, a disc revolvably attached to the fly wheel, having gripping pads on 'its sides and located between the first mentioned wheel and the fly wheel, a support movably attached to a base within which the fly wheel shaft is revolvably mounted, means for moving the support upwardly or downwardly whereby the position 'of the fly wheel may be changed, a lever pivoted on a bar secured to the base for moving the fly wheel shaft, the fly wheel and the disc, whereby the gripping pads on the disc may be made to contact with the first mentioned wheel and the fly wheel, means located on the lever for withdrawing the disc whereby the gripping pads are released from contact from the first mentioned wheel and the fly wheel, separate means located on the lever for stopping the fly wheel from revolving, and means formoving the lever upward or downward whereby the device may be thrown into or out of operation.

2. A motor attachment of the class de-- scribed comprising, in combination with a motor, a wheel secured to the driving shaft of the motor, a fly wheellocated adjacent the first mentioned wheel, a disc having gripping pads on its sides, revolvably attached on the fly wheel and located between the first mentioned wheel and the fly wheel,

a shaft forming a part of the fly wheel, a

support having a bearing therein for maintaining thefly wheel shaft on a base, means for moving the support whereby the position of the fly wheel may be changed, a lever for moving thefly wheel shaft, the fly wheel and the disc whereby the gripping pads on the disc may be made to contact with first mentioned wheel and the fly wheel, a forked member secured to the lever having its fork extended around the fly wheel shaft, for moving the flywheel shaft, the flywheel and the disc away from the first mentioned wheel, whereby the gripping pads may be released from contact with the first mentioned wheel and means secured to the fly wheel shaft for preventing the forks of the forked member from moving therefrom.

3. A motor attachment of the class described comprising, in combination with a,

motor having a driving shaft, a wheel secured to the driving shaft of the motor, a

fly wheel revolvably mounted on a base,

positioning the fly wheel either closer to or farther from the base, revolvably attached on the fly wheel and located between the first mentioned wheel and the fly wheel, and

means for moving the fly wheel and the friction disc, whereby the said friction disc may contact with the first mentioned wheel and the fly wheel.

first mentionedwheel whereby the disc may be made to contact with the said wheel and the fly wheel, and means attached to the lever for preventingthe rotation of the fly wheel with the first mentioned wheel.

5. A motor attachment of the class described, comprising, in combination with a power actuated shaft, a wheel rotatable thereby, a support adjustably attached to the base, a fly wheel revolvably mounted on the support, a clutch member located between the first mentioned wheel and the fly wheel and engageable with the said wheel and the fly wheel, a lever adjustably attached to the base for moving the fly wheel wherebythe clutch member is made to contact with first mentioned wheel and the fly wheel, and

means located on the said lever for releasing the clutch' member from contact with the first mentioned wheel.

6. A motor attachment of the class described comprising, in combination with a motor having a driving shaft, a base, a wheel secured to the driving shaft having means thereon for adjustably securing it to the base, a fly wheel revolvably mounted on the support and rotatable,therewith,.a support located adjacent the first mentioned wheel, a shaft integrally secured to the fly wheel and revolvably mounted on a base, a disc having friction pads on its sides located between the first mentioned wheel and the fly wheel and attached on the fly wheel, a thrust bearing located at the end of the driving shaft of the motor, means for adjustably positioning the lever either closer to or farther from the base, a ball secured on the end of the fly wheel shaft, a lever mounted on the base and adapted to be operated against the ball on the fly wheel shaft, whereby the fly wheel shaft, the fly wheel and the disc may be moved inwardly to cause the friction pads of the disc to contact with the first mentioned wheel and the fly wheel, and a member secured to the lever for withdrawing the fly wheel and the disc, whereby the friction pads are released from contact with the first mentioned wheel, and means secured to the lever for preventing the fly wheel from revolving.

BARNET GROSSBARD. 

